foo.cc: In function 'int main()':
foo.cc:38:7: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if (n=6)
      ~^~
foo.cc:26:7: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
       if (t==0)
       ^~
foo.cc:16:4: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if (b==0)
    ^~

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